PHP $_REQUEST using an Array?

maeve100
maeve100 used Ask the Experts™
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Hi there,

I have an array of variables 100,101,102 - which are ID numbers.  I want to be able to call $_REQUEST["102"] - but using $_REQUEST["$_SESSION['ID'][2]"];  This bombs out, so I need to know the correct formatting for doing something like this.

Thanks!
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you could try something like this instead:

$session_id = $_SESSION['ID'][2];
$_REQUEST[$session_id];


I also think this might be your problem:
$_REQUEST["$_SESSION['ID'][2]"];
should be:
$_REQUEST[$_SESSION['ID'][2]];

I personally use the 1st method though...I don't like too many brackets within each other, so it's nicer and cleaner
Ali KayahanFull Stack Developer

Commented:
Also

extract($_SESSION);

$_REQUEST[$id['2']];
Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
$_REQUEST is an associative array that by default contains the contents of $_GET, $_POST and $_COOKIE.  All of these are set by a page request from a form in a browser.  If the 'name' key you're asking for wasn't set by the page request, then it will cause an error.  A similar situation exists with $_SESSION variables.  If they are not already set, you will get an error trying to use them.

This $_REQUEST["$_SESSION['ID'][2]"]; tries to use the value of the $_SESSION variable as the name of the $_REQUEST variable.  Are you 'POST'ing the 'id's from a page?  Are the $_SESSION variables already set on a previous page?
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Commented:
If you want to get value from an array, you need to specify two things:
1. the array --> I can see it's $_REQUEST
2. the key (or what might create the key) --> don't know yet. Can you be more specific?

Author

Commented:
roynaufal: $_REQUEST[$_SESSION['ID'][2]]; Does not work, the value of the request won't print - even though $_session['id'][2] prints the right value by itself.

dsmile: The $_REQUEST is a simple posted value of a single number.  The key/name of the hidden input is an ID number that I have stored in $_session['id'][1], $_session['id'][2], etc.

DaveBaldwin: You are correct that I am trying to use the session variable as the name of the request variable.  The REQUEST is a posted value of quantity, associated with the ID stored in the session variable.  The Session variables are set up previously in another page.

Thank you!
Fixer of Problems
Most Valuable Expert 2014
Commented:
I would make it a two-step process (in part to make it easy for me to keep track).  I also just read on http://us2.php.net/manual/en/function.array.php that you are supposed use curly braces inside double quotes to access array variables.
// two-step
$idn2 = $_SESSION['ID'][2];
$item = $_REQUEST["$idn2"];

// original with curly braces
$_REQUEST["{$_SESSION['ID'][2]}"];

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